A device for using steam pressure to force feed-water into the boiler. Some designers preferred to use pumps because injectors were temperamental (therefore two were usually fitted) and originally they would work only with cold water.

A supervisory but non-managerial grade (equivalent to an Army NCO) whose job was to monitor the performance of staff or processes. Those most likely to come into contact with the public were the Ticket Inspectors, but there were Inspectors (supervisors) for most railway occupations such as SignallingInspectors, Locomotive Drivers’ Inspectors and the like.

A coupling similar to the Three-Link coupling but with a pear shaped middle link, with irregularities that enable it to hold fast whether in a horizontal (long) or vertical (short) position and allow the shunter’s pole to lever them into either position. The short form holds the vehicles closer together while running, while the long form makes coupling and uncoupling easier.

A medium-distance secondary train (often but not always formed of non-corridor or possibly lavatory stock) which ran through or between termini in two different Traffic Districts, and thus was the operating responsibility of both of them. After WW1 the LNWR designated a large number of trains as “Inter-District Sets” which were intended to be “general purpose” and hence improve flexibility and utilisation. Main line express and purely local train sets were organised differently.

A means of physically preventing apparatus (e.g.. points, signals) from being placed in potentially dangerous positions, particularly preventing one device being moved unless others are in the correct position.

The Euston-Holyhead and Holyhead-Euston boat trains which connected with the Holyhead-Kingstown (now Dun Laoghaire) steam packets, and carried mail to and from Ireland under government contract. The day Irish Mails left Euston at 8.30 (which became 8.45 during the 1930s under the LMS) and Holyhead at 17.30; the night Irish Mails left Euston at 20.45 and Holyhead at 0.07. These trains were named even under the LNWR (which was not given to naming trains). To enable the trains to run non-stop from Chester to Holyhead and vice versa, the first water troughs were laid at Mochdre, on the North Wales coast.